package com.itheima.reggie.controller;

import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.itheima.reggie.common.BaseContext;
import com.itheima.reggie.common.R;
import com.itheima.reggie.entity.ShoppingCart;
import com.itheima.reggie.service.ShoppingCartService;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.*;

import java.time.LocalDateTime;
import java.util.List;

/**
 * 购物车
 */
@Slf4j
@RestController
@RequestMapping("/shoppingCart")
public class ShoppingCartController {

    @Autowired
    private ShoppingCartService shoppingCartService;

    /**
     * 添加购物车
     */
    @PostMapping("/add")
    public R<ShoppingCart> add(@RequestBody ShoppingCart shoppingCart){

        log.info("购物车数据：",shoppingCart);
        //设置用户id，指定当前是哪个用户的购物车数据
        Long currentId = BaseContext.getCurrentId();
        shoppingCart.setUserId(currentId);
        //判断当前添加的是菜品还是套餐
        Long dishId = shoppingCart.getDishId();
        LambdaQueryWrapper<ShoppingCart> queryWrapper = new LambdaQueryWrapper<>();
        queryWrapper.eq(ShoppingCart::getUserId,currentId);
        if (dishId != null){
            //添加到购物车的是菜品
            queryWrapper.eq(ShoppingCart::getDishId,dishId); //还要添加这个条件是因为在后续判断菜品是否再购物车中的时可以锁定该菜品的那一条数据
        }
        else {
            //添加到购物策划的是套餐
            queryWrapper.eq(ShoppingCart::getSetmealId,shoppingCart.getSetmealId());
        }
        ShoppingCart shoppingCartOne = shoppingCartService.getOne(queryWrapper);
        //查询当前菜品或者套餐是否在购物车中
        if (shoppingCartOne != null){
            //如果存在，就在原来的数量上加一
            Integer number = shoppingCartOne.getNumber();
            shoppingCartOne.setNumber(number+1);
            shoppingCartService.updateById(shoppingCartOne);
        }
        else {
            //如果不存在，则添加到购物车，数量默认为一
            shoppingCart.setNumber(1);
            shoppingCart.setCreateTime(LocalDateTime.now());
            shoppingCartService.save(shoppingCart);
            shoppingCartOne = shoppingCart;
        }
        return R.success(shoppingCartOne);

    }

    /**
     * 购物车订单减一
     * @param shoppingCart
     * @return
     */
    @PostMapping("/sub")
    public R<ShoppingCart> delete(@RequestBody ShoppingCart shoppingCart){

        Long currentId = BaseContext.getCurrentId();
        LambdaQueryWrapper<ShoppingCart> queryWrapper = new LambdaQueryWrapper<>();
        queryWrapper.eq(ShoppingCart::getUserId,currentId);
        Long dishId = shoppingCart.getDishId();
        if (dishId != null){
            queryWrapper.eq(ShoppingCart::getDishId,dishId);
        }
        else{
            queryWrapper.eq(ShoppingCart::getSetmealId,shoppingCart.getSetmealId());
        }
        ShoppingCart cartServiceOne = shoppingCartService.getOne(queryWrapper);
        Integer number = cartServiceOne.getNumber();
        if (number > 1 ){
            cartServiceOne.setNumber(number-1);
            shoppingCartService.updateById(cartServiceOne);
            return R.success(cartServiceOne);
        }
        else {
            shoppingCartService.remove(queryWrapper);
            ShoppingCart oneAfterDelete = shoppingCartService.getOne(queryWrapper);
            return R.success(oneAfterDelete);
        }

    }

    /**
     * 查看购物车
     * @return
     */
    @GetMapping("/list")
    public R<List<ShoppingCart>> list(){

        log.info("查看购物车...");
        LambdaQueryWrapper<ShoppingCart> queryWrapper = new LambdaQueryWrapper<>();
        queryWrapper.eq(ShoppingCart::getUserId,BaseContext.getCurrentId());
        queryWrapper.orderByAsc(ShoppingCart::getCreateTime);
        List<ShoppingCart> list = shoppingCartService.list(queryWrapper);
        return R.success(list);

    }

    /**
     * 清空购物车
     * @return
     */
    @DeleteMapping("/clean")
    public R<String> clean(){

        LambdaQueryWrapper<ShoppingCart> queryWrapper = new LambdaQueryWrapper<>();
        queryWrapper.eq(ShoppingCart::getUserId,BaseContext.getCurrentId());
        shoppingCartService.remove(queryWrapper);
        return R.success("清空购物车成功");

    }
}
